Result
This page has no server side at all. The table you paste is parsed by JavaScript inside your own browser, the chart is drawn on a canvas element on your machine, and the export file is assembled locally. Nothing is uploaded, stored or written to any log. You can disconnect from the network after the page has loaded and everything will still work — which is the simplest way to verify the claim yourself.
Facts and limits of this method
| Base unit | Liter per second — all other units convert through it |
|---|---|
| 1 m³/h | ≈0.277778 L/s |
| 1 GPM (US) | ≈0.0630902 L/s (US gallon per minute) |
| Total units | 6 — L/s, L/min, L/h, m³/h, m³/s, GPM |
When it misleads you
- The calculation happens in two steps: the value is first converted to liters per second, then from liters per second to the target unit, so choosing the same unit for "from" and "to" leaves the result unchanged.
- GPM in this converter is the US gallon per minute, based on the US gallon (3.785411784 L); British practice sometimes uses the imperial gallon (4.54609 L), giving a different GPM number for the same real flow.
- Cubic meters per hour (m³/h) is common in pump, HVAC and heating equipment specifications in metric-using countries — don't confuse it with cubic meters per second (m³/s), which gives much larger numbers for the same flow.
- Rounding is applied only to the displayed result — internal calculations use the full precision of JavaScript floating-point numbers.
How it is calculated
Each of the six units has a preset conversion factor to liters per second — for example, 1 m³/h ≈ 0.277778 L/s, 1 GPM ≈ 0.0630902 L/s.
The entered value is multiplied by the factor of the selected "from" unit, giving flow rate in liters per second.
The flow rate in liters per second is divided by the factor of the "to" unit, giving the result in the target unit.
The result is rounded to the chosen number of decimal places and updates instantly whenever the value, units or precision change.
Questions and answers
Which GPM does the converter use — US or imperial?
US GPM, based on the US gallon. If a source states imperial GPM (UK, Canada), the result will differ by about 20%, since the imperial gallon is larger than the US gallon.
Where are m³/h and L/min typically used?
Cubic meters per hour is more common in industrial pump, HVAC and building water supply specifications, while liters per minute is common in household plumbing, irrigation and small pumps.
Can this converter be used for gas flow?
Yes, volumetric flow rate units apply equally to liquids and gases — the converter performs a purely arithmetic conversion of volume per unit time.
Is my data sent anywhere?
No, the whole calculation runs in your browser.